The Bosch PM1-LISD Loudspeaker DC Blocking Board is designed to enhance the efficiency and reliability of public address and voice alarm systems. It enables redundant loudspeaker loops, significantly reducing the cost and complexity of installations by minimizing the requirement for expensive E30-rated cabling. With six loudspeaker loops per Master Unit and support for up to 50 Isolator Boards per loop, it ensures continuous and fail-safe audio distribution.
The unit operates on 24V and 48V DC backup power, ensuring uninterrupted performance even during power failures. Additionally, the Walk Test mode and installation test button make troubleshooting and fault detection easy, saving time during setup and maintenance. Ideal for large-scale installations, the PM1-LISD enhances system reliability while optimizing installation costs.